CWE-804—Guessable CAPTCHA

Weakness Name

Guessable CAPTCHA

Description

The product uses a CAPTCHA challenge, but the challenge can be guessed or automatically recognized by a non-human actor.

An automated attacker could bypass the intended protection of the CAPTCHA challenge and perform actions at a higher frequency than humanly possible, such as launching spam attacks. There can be several different causes of a guessable CAPTCHA:

Common Consequences

Scope:

Access Control, Other

Impact:

Bypass Protection Mechanism, Other

Notes:

When authorization, authentication, or another protection mechanism relies on CAPTCHA entities to ensure that only human actors can access certain functionality, then an automated attacker such as a bot may access the restricted functionality by guessing the CAPTCHA.

Related Weaknesses

• CWE-863Incorrect AuthorizationHigh
• CWE-1390Weak Authentication